Q. Which of the following naturally occurring substances is correctly matched to its primary element?

1. Diamond - Carbon
2. Marble - Oxyen
3. Sand - Silicon
4. Ruby - Aluminium

Select the correct option from the codes given below:
Answer: Only 1, 3 & 4
Notes: Diamond is composed of carbon and is thus rightly matched. Sand is primarily made up of silicon dioxide, so it is correctly matched with silicon. Ruby is a variety of the mineral corundum, which is primarily composed of aluminium oxide, so it is correctly matched. Marble, however, is primarily made up of calcium carbonate, which makes its primary element less straightforward. Hence, the correct answer is [B] Only 1, 3 & 4.

This question is part of 40000+ MCQs GKToday PCS Mock Tests Series in GKToday Android app. Question Number: 38 in GKToday PCS Mock Test - 5 in above course in App.